Imfreehand

Hi, how can i save the image that i have been modified using imfreehand when i want used getappdata? that is mam code:

figure, imshow('pout.tif'); h = imfreehand; position = wait(h);

value = getappdata(h,'obraz')

[Amith Kamath]

How exactly are you 'modifying' the image using imfreehand? Also, from http://www.mathworks.com/help/toolbox/images/ref/imfreehand.html, there doesn't seem to be a property called 'obraz'. Am I missing something?

[Agata]

I want save the image in variable 'obraz' after when I used the imfreehand, because I must write paintbrush like in paint.

Answer 1

[Image Analyst]

See if my imfreehand demo helps you:

% Demo to have the user freehand draw an irregular shape over
% a gray scale image, have it extract only that part to a new image,
% and to calculate the mean intensity value of the image within that shape.
% By ImageAnalyst

% Change the current folder to the folder of this m-file.
if(~isdeployed)
  cd(fileparts(which(mfilename)));
end
clc;  % Clear command window.
clear;  % Delete all variables.
close all;  % Close all figure windows except those created by imtool.
imtool close all;  % Close all figure windows created by imtool.
workspace;  % Make sure the workspace panel is showing.
fontSize = 16;

% Read in standard MATLAB gray scale demo image.
grayImage = imread('cameraman.tif');
subplot(2, 3, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
set(gcf, 'Position', get(0,'Screensize')); % Maximize figure.
message = sprintf('Left click and hold to begin drawing.\nSimply lift the mouse button to finish');
uiwait(msgbox(message));
hFH = imfreehand();

% Create a binary image ("mask") from the ROI object.
binaryImage = hFH.createMask();
% Display the freehand mask.
subplot(2, 3, 2);
imshow(binaryImage);
title('Binary mask of the region', 'FontSize', fontSize);

% Calculate the area, in pixels, that they drew.
numberOfPixels1 = sum(binaryImage(:))
% Another way to calculate it that takes fractional pixels into account.
numberOfPixels2 = bwarea(binaryImage)

% Get coordinates of the boundary of the freehand drawn region.
structBoundaries = bwboundaries(binaryImage);
xy=structBoundaries{1}; % Get n by 2 array of x,y coordinates.
x = xy(:, 2); % Columns.
y = xy(:, 1); % Rows.
subplot(2, 3, 1); % Plot over original image.
hold on; % Don't blow away the image.
plot(x, y, 'LineWidth', 2);

% Burn line into image by setting it to 255 wherever the mask is true.
burnedImage = grayImage;
burnedImage(binaryImage) = 255;
% Display the image with the mask "burned in."
subplot(2, 3, 3);
imshow(burnedImage);
caption = sprintf('New image with\nmask burned into image');
title(caption, 'FontSize', fontSize);
% Mask the image and display it.
% Will keep only the part of the image that's inside the mask, zero outside mask.
blackMaskedImage = grayImage;
blackMaskedImage(~binaryImage) = 0;
subplot(2, 3, 4);
imshow(blackMaskedImage);
title('Masked Outside Region', 'FontSize', fontSize);
% Calculate the mean
meanGL = mean(blackMaskedImage(binaryImage));
% Report results.
message = sprintf('Mean value within drawn area = %.3f\nNumber of pixels = %d\nArea in pixels = %.2f', ...
meanGL, numberOfPixels1, numberOfPixels2);
msgbox(message);

% Now do the same but blacken inside the region.
insideMasked = grayImage;
insideMasked(binaryImage) = 0;
subplot(2, 3, 5);
imshow(insideMasked);
title('Masked Inside Region', 'FontSize', fontSize);

% Now crop the image.
topLine = min(x);
bottomLine = max(x);
leftColumn = min(y);
rightColumn = max(y);
width = bottomLine - topLine + 1;
height = rightColumn - leftColumn + 1;
croppedImage = imcrop(blackMaskedImage, [topLine, leftColumn, width, height]);
% Display cropped image.
subplot(2, 3, 6);
imshow(croppedImage);
title('Cropped Image', 'FontSize', fontSize);

[tony]

hi, sir what if i wanna draw more than one freehand with the same image.. can u give me the example

thanks

[Image Analyst]

The example is above. Just call imfreehand twice and capture the output

hFH = imfreehand();
% Create a first binary image ("mask") from the ROI object.
binaryImage1 = hFH.createMask();
hFH = imfreehand();
% Create a second binary image ("mask") from the ROI object.
binaryImage2 = hFH.createMask();

[tony]

what if putting the dialogue box, so the user can draw many times that they want. is that possible sir?

[andhavarapu lokesh]

hi sir i want to crop a part of the image and save that image i wanted to read that image again is it possible please can you modify and give me

[Image Analyst]

Yes

croppedImage = imcrop(originalImage, boundingBox);
imwrite(croppedImage, filename);
% Read back in
theImage = imread(filename);

[HUSAM ZAKI MOHAMMED OTHMAN]

What if I want to use that mask to protect an object for seam carving? Please can you modify the code

[Image Analyst]

No, sorry that would be too much work for me to donate to you. The Mathworks can do it for you if you want to hire them. Good luck though.